Season 2
Overview
This season, Leonard gets a girl. So does Sheldon. Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart, ueberconfident Leslie Winkler reduces mere men to spineless jellyfish.
Episodes
1. The Bad Fish Paradigm
2008-09-22
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
2. The Codpiece Topology
2008-09-29
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
3. The Barbarian Sublimation
2008-10-06
Sheldon creates a monster when he introduces Penny to online gaming.
4. The Griffin Equivalency
2008-10-13
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
5. The Euclid Alternative
2008-10-20
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
6. The Cooper-Nowitzki Theorem
2008-11-03
Sheldon and the gang are confused when a young grad student is attracted to him.
7. The Panty Piñata Polarization
2008-11-10
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
8. The Lizard-Spock Expansion
2008-11-17
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
9. The White Asparagus Triangulation
2008-11-24
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
10. The Vartabedian Conundrum
2008-12-08
Leonard asks Penny for advice when his new relationship starts moving too fast.
11. The Bath Item Gift Hypothesis
2008-12-15
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
12. The Killer Robot Instability
2009-01-12
Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
13. The Friendship Algorithm
2009-01-19
Sheldon creates a scientific procedure for making friends.
14. The Financial Permeability
2009-02-02
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
15. The Maternal Capacitance
2009-02-09
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
16. The Cushion Saturation
2009-03-02
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
17. The Terminator Decoupling
2009-03-09
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
18. The Work Song Nanocluster
2009-03-16
Penny's home business turns into a complete nightmare when Sheldon takes over.
19. The Dead Hooker Juxtaposition
2009-03-30
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
20. The Hofstadter Isotope
2009-04-13
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
21. The Vegas Renormalization
2009-04-27
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
22. The Classified Materials Turbulence
2009-05-04
Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
23. The Monopolar Expedition
2009-05-11
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.